Telephone system.



BEST AVAILABLE COPY H. 0. RUGH.

v TELEPHONE SYSTEM.

APPLICATION FILED MAY 16. 1910.

UNITED STATES PATENT OFFICE.-- I

HARRY O. RUG-H, OF SANDWICH, ILLINOIS, ASSIGNOR TO SANDWICH ELECTRIC COM- PANY, 0F SANDWICH, ILLINOIS, A CORPORATION OF ILLINOIS.

TELEPHONE SYSTEM.

Specification of Letters Patent.

To all whom it may concern:

Be. it known that I, HARRY O. RUGH, a citizen of the United States, residing at Sandwich, in the countyof Dekalb and State of Illinois, have invented a certain new and useful Improvement in Telephone Systems, of which the following is a full, clear, con cise, and exact description, reference being had to the accompanyingdrawings, forming a art of this specification.

lIy invention relates to telephone systems, and has for its object the arrangement of'a plurality of telephone circuits in such man ner that, for instance, three operative talking .circuits can be obtained from two metallic telephone circuits.

My invention contemplates new arrangements, of parts to accomplish this result, and at the sametime provides facilities for making adjustments which have been. found necessary in practice to make systems of this kind operative, and which adjustments have hitherto been very difficult of attainment and been frequently impossible.

The improved'adjusting features are describedand claimed in my co-pending application, Serial No. 539,165, filed Jan. 20, 1910, the claims herein being limited to the system itself.

I will describe my invention in detail by reference to the accompanying drawing illustrating the preferred embodiment'thereof, inswliich:

Figure'l diagrammatically shows a system in accordance with my invention, and: Fig. 2 shows a detail view of adjusting means employed.

In Fig. 1,jI'sho'w two metallic telephone circuits consistingrespectively of the circuit composed of the line Wires 1 and 2, and a circuit composed of the line wires 3 and 4:. These line wires connect station A with the station E, and' it is designed that each metallic circuit shall accommodate calling devicesat a plurality of substations, which calling devlces are indicated for butone sta- 1 tion on each circuit, they being similar in the various circuits, said stat1ons;be1ng G and D. The only difference at the various substations consists in placing an arm 5 in adiiferent annular posit-1011 1n order to selectively call signals 6, under the oontrol thereof. Each signal is associated with a contact element 7, under the control of stepby-step mechanism 8, which step -by step v mechanism is adapted. for progressive forward movement through the magnet 9 and adaptedto be restored the magnet 10, which magnets are associated with contact elements 11 and 12, respectively, under the control of the armature 13 of the relay. 14, which relay 14 is selectively operated by currents of difi'erent polarity as impressed on the line wires by keys 15 and 16, respec tively, thus to place the armature 13 in contact-making position w ith either element 11 Patented July 18, 1911 or element 12, thereby to step-up the element I 8 to its proper position through theagency of current-in batteries 17 and 18, and to release said element. Each of the line circuits 1 l, 2 and 3, 4 ends iii-jacks 19 and 20,'respectively, at their opposite ends, which are 1 adapted to. be engaged by a plug 21 actin in connection with a telephone set 22, an -a high frequency ringing generator 23, as V will be apparent.

Thus, telephonic communlcationjcan be had over the two respective metallic circuits, and means are provided'for selectively calling telep ones distributed.

throughout said metallic circuits. I further contemplate means whereby a third telephone circuit can be established over the four line wires without interfering with the two metallic circuits above mentioned,-,.Jnd this third circuit ends'in jacks 24., 24, the two terminals of said circuits 25 and 26' being'tiiiiiiected respectively to neutral points of impedance provided with the circuits 1, 2 and 3 d. The terminal 26 is connected to the neutral-point of impedances 27 and 28,

which, together with condensers- 29 and 30,

are bridged across the line wires of circuit 1, 2 as shown. The terminal 25 is connected to a switch arm 32 movable {over an a lustable resistance 31, interposed between im- .pedance coils 27 and 28,'thereby more accurately to select the neutral point.

Besides the necessity- (3f selecting the neutral point, which may be found necessary in both, circuits, I provide condensers 30, which are adjustable in order to properly adjust the capacity to the minutest detail. This I accomplish by the construction more clearly shown in Fig. 2, in which I have shown the condenser 30 as consisting of two" electrodes 33 and 34:, the electrode 33- being preferably formed of leaves 35, all permanently connected tothe electrode 33. -The electrode34- has a plurality of'leaves '36, permanently connected to the said electrode,

the relay 41.

and a further plurality of leaves 37 terminating from contact plates 38. The electrode further terminates in a contact plate 3?. I employ a rotatable quadrant ell-O, which is adapted to add more or less of the leaves 37 to the electrode 34, to thereby increase or decrease the capacity of said condenser 30. By thus being enabled to ad just within the limits of the capacity of one leaf, I secure results which I have hitherto found impossible in the adjustment of circuits such as above outlined.

The signaling circuit at the stations A and B comprises a relay 4-1 connected as shown having an armature 42 which occu pies normally one of two alternativeposi- (ions depending upon the polarity of the current through the said relay 4E1. lhe armature 42 thus normally closes the circuit through relay 43 and battery 46. This circuit being closed, the armature of relay 4&3 is attracted to open the circuit normally 1 through the signal 14 and battery 45, when alternating or similar currents traverse the relay 11. The armature 4:2 in 1ts travel from one alternative position to, the other momentarily interrupts the circuit of the relay 4C3, thereby permitting its armature to retract in accordance with these impulses, thereby to periodically close circuit through the signal 4% and battery 45 to operate said signal when such vibratory or similar currents are lmpressed on the circuit including While I have herein shown and particularly described the preferred embodiment of my invention, I do not desire to limit myself to the precise construction and arrange- .smentas herein set forth, but

Having thus described my inventiomwhat aeao io phone at each extremity of said circuits to the neutral point of the eorrespondmg bridges, means for adjusting the capacity of one of said condensers, and a signal-receiving device for each telephone, consisting of .a relay having an amature provided with electrically connected front and back con tacts, a relay and battery associated with said contacts and armature, and a local signal under the control of said last-mentioned relay.

2. fr metallic line circuits, a bridge across each end of each circuit consisting of a condenser,

-t.wo impedance coils, and a condenser, in

the order named, means for connecting a telephone at each extremity of said circuits to the neutral point of the corresponding bridges, and a signal-receiving device for each telephone, consisting of a relay having an armature provided with electrically connected front and back contacts, a relay and battery associated with said contacts and arn'iature, and a local signal under the control of said last mentioned relay. H

in witness whereof, I hereunto subscribe my name this twentieth day of April A. D.,

HARRY U. RUGH Witnesses MAX "W. ZABEL,

{AZEL Jones.

Gopies of this patent may be obtained for five cents each, by addressing the Commissioner of iratents,

Washington, D. C.

telephone system consisting of two 

